<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>登录页面</title>
</head>
<body>
<h1>登录页面</h1>
<span style="color:red" th:text="${msg}"></span>
<form method="post" action="login">
  <input type="text" name="username" /><br>
  <input type="password" name="password"><br>
  <input type="submit" name="submit" value="登录">
</form>
</body>
</html>